2. Agapanthus. Often grown in the parking lots of supermarkets. Boring, boring, boring.
4. Cannas. I want to love them, I truly do, but they are a 1970s gardening cliche and I just can’t go there. Like those little button-up shirts with the ruffles down the front and the puffly sleeves that have come back for some unknown reason. Hated them the first time; can’t ever go back there.
5. Coleus. See Impatiens. Add pansies to that.
6. Others too numerous to mention: caladium, daylilies, those irritating little marguerite daisies, especially the pink one called "Cobbity," all ferns, dull and overused landscape shurbs like pittosporum, ivy in all its forms, and houseplants. The sooner they get to the compost pile, the better.